Only enable rustls if native-tls is not enabled

src/client.rs

@@ -47,7 +47,7 @@ mod encryption {
     }
 }
 
-#[cfg(feature = "use-rustls")]
+#[cfg(all(feature = "use-rustls", not(feature = "use-native-tls")))]
 mod encryption {
     use rustls::ClientConfig;
     pub use rustls::{ClientSession, StreamOwned};

src/error.rs

@@ -11,7 +11,7 @@ pub mod tls {
     pub use native_tls::Error;
 }
 
-#[cfg(feature = "use-rustls")]
+#[cfg(all(feature = "use-rustls", not(feature = "use-native-tls")))]
 pub mod tls {
     //! TLS error wrapper module, feature-gated.
     pub use rustls::TLSError as Error;
@@ -50,10 +50,10 @@ pub enum Error {
     #[cfg(feature = "use-native-tls")]
     /// TLS error
     Tls(tls::Error),
-    #[cfg(feature = "use-rustls")]
+    #[cfg(all(feature = "use-rustls", not(feature = "use-native-tls")))]
     /// TLS error
     Tls(tls::Error),
-    #[cfg(feature = "use-rustls")]
+    #[cfg(all(feature = "use-rustls", not(feature = "use-native-tls")))]
     /// DNS name resolution error.
     Dns(tls::DnsError),
     /// - When reading: buffer capacity exhausted.
@@ -82,9 +82,9 @@ impl fmt::Display for Error {
             Error::Io(ref err) => write!(f, "IO error: {}", err),
             #[cfg(feature = "use-native-tls")]
             Error::Tls(ref err) => write!(f, "TLS error: {}", err),
-            #[cfg(feature = "use-rustls")]
+            #[cfg(all(feature = "use-rustls", not(feature = "use-native-tls")))]
             Error::Tls(ref err) => write!(f, "TLS error: {}", err),
-            #[cfg(feature = "use-rustls")]
+            #[cfg(all(feature = "use-rustls", not(feature = "use-native-tls")))]
             Error::Dns(ref err) => write!(f, "Invalid DNS name: {}", err),
             Error::Capacity(ref msg) => write!(f, "Space limit exceeded: {}", msg),
             Error::Protocol(ref msg) => write!(f, "WebSocket protocol error: {}", msg),
@@ -160,14 +160,14 @@ impl From<tls::Error> for Error {
     }
 }
 
-#[cfg(feature = "use-rustls")]
+#[cfg(all(feature = "use-rustls", not(feature = "use-native-tls")))]
 impl From<tls::Error> for Error {
     fn from(err: tls::Error) -> Self {
         Error::Tls(err)
     }
 }
 
-#[cfg(feature = "use-rustls")]
+#[cfg(all(feature = "use-rustls", not(feature = "use-native-tls")))]
 impl From<tls::DnsError> for Error {
     fn from(err: tls::DnsError) -> Self {
         Error::Dns(err)

src/lib.rs

@@ -29,6 +29,3 @@ pub use crate::{
     protocol::{Message, WebSocket},
     server::{accept, accept_hdr},
 };
-
-#[cfg(all(feature = "use-native-tls", feature = "use-rustls"))]
-compile_error!("either \"use-native-tls\" or \"use-rustls\" can be enabled, but not both.");

src/stream.rs

@@ -10,7 +10,7 @@ use std::net::TcpStream;
 
 #[cfg(feature = "use-native-tls")]
 use native_tls::TlsStream;
-#[cfg(feature = "use-rustls")]
+#[cfg(all(feature = "use-rustls", not(feature = "use-native-tls")))]
 use rustls::StreamOwned as TlsStream;
 
 /// Stream mode, either plain TCP or TLS.
@@ -41,7 +41,7 @@ impl<S: Read + Write + NoDelay> NoDelay for TlsStream<S> {
     }
 }
 
-#[cfg(feature = "use-rustls")]
+#[cfg(all(feature = "use-rustls", not(feature = "use-native-tls")))]
 impl<S: rustls::Session, T: Read + Write + NoDelay> NoDelay for TlsStream<S, T> {
     fn set_nodelay(&mut self, nodelay: bool) -> IoResult<()> {
         self.sock.set_nodelay(nodelay)

tests/connection_reset.rs

@@ -15,7 +15,7 @@ use url::Url;
 
 #[cfg(feature = "use-native-tls")]
 type Sock = WebSocket<Stream<TcpStream, native_tls::TlsStream<TcpStream>>>;
-#[cfg(feature = "use-rustls")]
+#[cfg(all(feature = "use-rustls", not(feature = "use-native-tls")))]
 type Sock = WebSocket<Stream<TcpStream, rustls::StreamOwned<rustls::ClientSession, TcpStream>>>;
 
 fn do_test<CT, ST>(port: u16, client_task: CT, server_task: ST)